Synchronous split screen software is a tool to realize the synchronous display of screens between multiple devices, which can transmit the screen content of one device to other devices in real time. However, the synchronization software on the same screen cannot directly access or view the other party's WeChat information. Wechat is an encrypted instant messaging application. In order to protect users' privacy and information security, WeChat adopts end-to-end encryption technology, and only the sender and receiver can decrypt and view the message content. The function of synchronous split screen software is to realize the synchronous display of screen content among multiple devices. For example, in conference, education, training and other scenarios, the speaker's screen content can be synchronized to the audience's equipment, so that everyone can watch and participate in it in real time. The same screen synchronization software does not have the ability to break through WeChat encryption, and it is impossible to directly view the other party's WeChat information.